Change dumbdbm to use bytes keys.
diff --git a/Lib/test/test_whichdb.py b/Lib/test/test_whichdb.py
index 6cb5e4f..675507a 100644
--- a/Lib/test/test_whichdb.py
+++ b/Lib/test/test_whichdb.py
@@ -51,7 +51,7 @@
         self.assertEqual(name, whichdb.whichdb(_fname))
         # Now add a key
         f = mod.open(_fname, 'w')
-        f["1"] = b"1"
+        f[b"1"] = b"1"
         f.close()
         self.assertEqual(name, whichdb.whichdb(_fname))
     setattr(WhichDBTestCase,"test_whichdb_%s" % name, test_whichdb_name)